I cannot divulge that information at this time as it may compromise our agents in the field........
Maybe it is time to remind such agents what it means to be part of the team.
Additionally, this agent wouldn't personally benefit in any way from any "accidental" falsehoods that are let loose in the public sphere, right ? Of course, like no other he understands the undesireable effects such an accident can lead to. God forbid, he should find himself at the receiving end.
Maybe discuss this with him the next time you grap a beer together.
Wouter